4 lines
395 B
Plaintext
4 lines
395 B
Plaintext
Passwords are stored in the /etc/shadow file, which is restricted to the root user.
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A standard user cannot write to it directly. However, the passwd executable is owned by root and has the SUID permission set.
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When a standard user runs passwd, the SUID bit tells the system to execute the program with the privileges of root,
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giving the program the temporary permissions to update /etc/shadow |